#604: cop/save image not work under Linux

[lidaobing]

Summary by Sourcery

This pull request addresses the issue with the 'Save Image' functionality not working under Linux by properly managing the image popup menu. Additionally, it refactors the image context menu creation to be initialized once after the window is created, enhancing code maintainability.

• Bug Fixes:
  • Fixed the issue where the 'Save Image' functionality was not working under Linux by ensuring the image popup menu is properly created and managed.
• Enhancements:
  • Refactored the image context menu creation to be initialized once after the window is created, improving code maintainability and reducing redundancy.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request refactors the image context menu handling in the DialogBase class to fix the issue of saving images not working under Linux. The changes include introducing a new method, afterWindowCreated, to initialize the image context menu and updating the OnImageButtonPress, OnSaveImage, and OnCopyImage methods to use class members for the menu and active image. Additionally, the afterWindowCreated method is called in the CreateMainWindow methods of DialogGroup and DialogPeer to ensure proper initialization.

File-Level Changes

Files	Changes
src/iptux/DialogBase.cpp src/iptux/DialogBase.h	Refactored image context menu handling by introducing afterWindowCreated method and using class members for menu and active image.
src/iptux/DialogGroup.cpp src/iptux/DialogPeer.cpp	Ensured afterWindowCreated is called after main window creation to initialize image context menu.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 52.17391% with 11 lines in your changes missing coverage. Please review.

Project coverage is 51.47%. Comparing base (0b47207) to head (f780bc2).

Files	Patch %	Lines
src/iptux/DialogBase.cpp	47.61%	11 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #607 +/- ## ========================================== + Coverage 51.37% 51.47% +0.10% ========================================== Files 64 64 Lines 8345 8354 +9 ========================================== + Hits 4287 4300 +13 + Misses 4058 4054 -4 ```

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