Notepad++ 7.8 Release Candidate 5
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 @SinghRajenM Used the Windows free upgrade offer or something? The 64-bit registry hive will have the correct ProductName. The solution would be: if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, TEXT("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion"), 0, KEY_READ, &hKey) == ERROR_SUCCESS)To if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, TEXT("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion"), 0, KEY_READ|KEY_WOW64_64KEY, &hKey) == ERROR_SUCCESS)
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 @AngryGamer said in Notepad++ 7.8 Release Candidate 5: @SinghRajenM Used the Windows free upgrade offer or something? Yes, I upgraded to win10 long back from win7. Moreover, I reghost the PC multiple times post upgrade. Currently, running on latest build. But does it matter? MS is very careless. It does not listen users. This bug is there from the build 1803 (may be even earlier) and not resolved yet (1903). MS bug. Not only this, I have reported few issue on Visual Studio 17/19. They simply close the bug saying “not reproducible” etc. 
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 After opening a Python file, indentation guide lines style is set to Python style for all subsequently opened files, regardless of their file type. Additionally, when switching from a tab with a Python file to a tab with e.g. a C file which has been opened before the Python file, the C file’s indentation guide lines style is set to Python style. When switching to another non-Python file and back to the C file, the C file’s indentation guide lines stlye is set to Standard style again. 
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 What do you mean by "indentation guide lines in Python style "? 
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 @donho said in Notepad++ 7.8 Release Candidate 5: What do you mean by "indentation guide lines in Python style "? Indentation guide lines Standard style:  Indentation guide lines Python style:  
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 @dinkumoil 
 OK, I see what it is indentation guide lines in Python style.
 You said:After opening a Python file, indentation guide lines style is set to Python style for all subsequently opened files, regardless of their file type Could you provide the screenshot of a c++ file in in Python style, please? 
 I follow your instructions but all the open files (c++) show standard guideline.
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 @donho said in Notepad++ 7.8 Release Candidate 5: Could you provide the screenshot of a c++ file in in Python style, please? NppBigSwitch.cpp with indentation guide lines Standard style:  NppBigSwitch.cpp with indentation guide lines Python style:  Steps to reproduce, part 1- Create in Windows Explorer an empty file bla.py.
- Create in Windows Explorer an empty file bla.pas.
- Start Notepad++.
- Load file bla.pywith Notepad++.
- Load file bla.paswith Notepad++.
- Load file NppBigSwitch.cppfrom Notepad++ source code and scroll to line 70.
- File NppBigSwitch.cppis displayed with indentation guide lines style Standard.
- Switch tab to file bla.pyand back to tab with fileNppBigSwitch.cpp.
- File NppBigSwitch.cppis displayed with indentation guide lines style Python.
- Switch tab to file bla.pasand back to tab with fileNppBigSwitch.cpp.
- File NppBigSwitch.cppis displayed with indentation guide lines style Standard again.
 Steps to reproduce, part 2- Start Notepad++.
- Load file NppBigSwitch.cppfrom Notepad++ source code and scroll to line 70.
- File NppBigSwitch.cppis displayed with indentation guide lines style Standard.
- Load file bla.pywith Notepad++.
- Switch tab to file NppBigSwitch.cpp.
- File NppBigSwitch.cppis displayed with indentation guide lines style Python.
- Load file NppCommands.cppfrom Notepad++ source code and scroll to line 158.
- File NppCommands.cppis displayed with indentation guide lines style Python.
- Load file bla.paswith Notepad++.
- Switch tab to file NppCommands.cpporNppBigSwitch.cpp.
- Both files are displayed with indentation guide lines style Standard.
 NppCommands.cpp with indentation guide lines Python style:  
- Create in Windows Explorer an empty file 
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 Thank you for the very detail description. I can reproduce it now. 
 I’ve tested in v7.7.1, in which python style guideline doesn’t work/exist.
 So it’s a bug, yes. But it’s not a regression for me.
 Except a quick solution can be provided, I would say it’ll be fixed in the next version.
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 The quick solution would be: At every tab switch (corresponds to fireing a NPPM_BUFFERACTIVATEDevent) Notepad++ has to check if the file of the current buffer is a Python file.- If yes -> set indentation guide lines style to Python.
- If no -> set indentation guide lines style to Standard.
 
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 @dinkumoil said in Notepad++ 7.8 Release Candidate 5: At every tab switch (corresponds to fireing a NPPM_BUFFERACTIVATED event) Notepad++ has to check if the file of the current buffer is a Python file The following code is in void ScintillaEditView::setLexer(int lexerID, LangType langType, int whichList):if (svp._indentGuideLineShow) { const auto currentIndentMode = execute(SCI_GETINDENTATIONGUIDES); // Python like indentation, excludes lexers (Nim, VB, YAML, etc.) // that includes tailing empty or whitespace only lines in folding block. const bool pythonLike = (lexerID == SCLEX_PYTHON || lexerID == SCLEX_COFFEESCRIPT || lexerID == SCLEX_HASKELL); const int docIndentMode = pythonLike ? SC_IV_LOOKFORWARD : SC_IV_LOOKBOTH; if (currentIndentMode != docIndentMode) execute(SCI_SETINDENTATIONGUIDES, docIndentMode); }It should be executed in each switch of tab. No idea why it doesn’t work. 
 You can provide the PR to fix it then I will include it in v7.8, otherwise I will fix it in the next release.
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 @donho said in Notepad++ 7.8 Release Candidate 5: You can provide the PR to fix it then I will include it in v7.8 Sorry, I’m not a C++ dev and I’m not familiar with the Notepad++ code, thus I’m not able to fix that issue. 
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 I wrote a plugin named ExtSettings (see >>> here <<<) that can configure the indentation guide lines style (and some other settings). I had to release a maintenance update because switching indentation guide lines style to the configured value didn’t work reliable anymore because of that new feature of Notepad++ related to the bug above. I already made a PR with the updated version, all checks have been successful. Would you mind to include the updated version into the plugin list that will be release with Npp v7.8? 
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