IoeCmcomc

**Is your feature request related to a problem? Please describe.** Since we can drag and drop .nbs files from Explorer into the program, it would be great if we could...

[Bug Report] Display language change doesn't work properly

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## Bug Report ### Current Behaviour: Changing the language only updates the menu bar when I switched to another tab. It also doesn't update labels in currently opened 3D editors....

**Describe the bug** When playing a song with looping is enabled in the editor, the editor always loop infinite times. The "Times to loop" song property is simply ignored, while...

Improve note selections and macro operations

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This pull request aims to improve the performance of selection-related actions, macro operations and song loading. It also allows users to undo and redo macro changes. ### Changes - Reimplement...

Handle `QTabWidget` tab shape and position

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Currently, the `tabShape` and `tabPosition` properties of `QTabWidget` doesn't work properly in all cases. 

Crash when changing application style from qlementine to a non-qlementine style

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The sandbox example crashes when the application style changes from `QlementineStyle `to a non-qlementine style (e.g. `fusion `or `windowsvista`) after the main window (`SandboxWindow`) is created. ### How to reproduce:...

Visual glitches when changing application style from qlementine to a non-qlementine style

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Visual glitches appear in the sandbox example when the application style changes from `QlementineStyle `to a non-qlementine style (e.g. `fusion `or `windowsvista`) after the main window (`SandboxWindow`) is created. ###...

Cannot apply changes in the project settings dialog

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**Describe the bug** Clicking the "OK" button in the project settings dialog do nothing visually, which make it impossible to change the project settings. **To Reproduce** Steps to reproduce the...