1.90.3: Menu sizing fix and backends work

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Changes

This is a small amend to v1.90.2. In particular, the fix to sizing of child menus seemed important enough to warrant a hot-fix. In 1.90.1 and 1.90.2, child menus with lots of contents wouldn't get clamped to parent viewport boundaries and therefore wouldn't show a scrollbar.

Breaking Changes:

• Backends: SDL2: Removed obsolete ImGui_ImplSDL2_NewFrame(SDL_Window*) signature which was obsoleted in 1.84. Calling ImGui_ImplSDL2_NewFrame() without parameter is fine.
• Backends: Vulkan: Moved RenderPass parameter from ImGui_ImplVulkan_Init() function to ImGui_ImplVulkan_InitInfo structure. Not required when using dynamic rendering. (#7308) [@shawnhatori]
• Backends: Vulkan: Using dynamic rendering now require filling the PipelineRenderingCreateInfo structure in ImGui_ImplVulkan_InitInfo, allowing to configure color/depth/stencil formats. Removed ColorAttachmentFormat field previously provided for dynamic rendering. (#7166, #6855, #5446, #5037) [@shawnhatori]

Other Changes:

• Menus, Popups: Fixed menus and popups with ChildWindow flag erroneously not displaying a scrollbar when contents is over parent viewport size. (#7287, #7063) [@ZingBallyhoo]
• Backends: SDL2, SDL3: Handle gamepad disconnection + fixed increasing gamepad reference counter continuously. Added support for multiple simultaneous gamepads. Added ImGui_ImplSDL2_SetGamepadMode() function to select whether to automatically pick first available gamepad, all gamepads, or specific gamepads. (#3884, #6559, #6890, #7180) [@ocornut, @lethal-guitar, @wn2000, @bog-dan-ro]
• Backends: SDL3: Fixed gamepad handling. (#7180) [@bog-dan-ro]
• Backends: SDLRenderer3: query newly added SDL_RenderViewportSet() to not restore a wrong viewport if none was initially set.
• Backends: DirectX9: Using RGBA format when allowed by the driver to avoid CPU side conversion. (#6575) [@Demonese]
• Internals: Fixed ImFileOpen not working before context is created, preventing creation of a font atlas before main context creation. (#7314, #7315) [@PathogenDavid, @ocornut]

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Dear ImGui is funded by your contributions and needs them to sustain and grow. We can invoice and accommodate to many situations. If your company uses Dear ImGui, please reach out (omar AT dearimgui DOT com). See Sponsors page.