## Description I noticed an inconsistent toolbar icon size for IPC API plugins on Windows with display scaling set to 125%. When the IPC plugin provides the following icon set: 24x24 32x32 48x48 64x64 the plugin toolbar icon is rendered noticeably larger than the surrounding KiCad toolbar icons. If I remove only the 32x32 bitmap and keep: 24x24 48x48 64x64 the icon is rendered at the expected size and visually matches the other toolbar icons. The 48x48 and 64x64 images do not cause the issue. The issue appears specifically when a 32x32 bitmap is included in the IPC plugin icon bundle. ### Additional observation The issue also occurs when the KiCad toolbar icon size is explicitly set to **Small**. Even with the toolbar configured to use small icons, including a 32x32 bitmap in the IPC plugin icon bundle still causes the wrong bitmap size to be selected/rendered. With: 24x24 32x32 48x48 64x64 the IPC plugin icon is still displayed too large. If only the 32x32 bitmap is removed: 24x24 48x48 64x64 the same plugin is rendered correctly with the **Small** toolbar icon setting. This suggests that the presence of the 32x32 bitmap affects bitmap selection independently of the toolbar icon size setting. {width=900 height=47} {width=900 height=34} ## Steps to reproduce 1. Use Windows with display scaling set to **125%**. 2. Install an IPC API plugin that provides toolbar icons in these sizes: 24x24 32x32 48x48 64x64 3. Start KiCad PCB Editor. 4. Observe that the IPC plugin toolbar icon is larger than the surrounding toolbar icons. {width=360 height=79} 5. Remove only the 32x32 icon from the plugin metadata, leaving: 24x24 48x48 64x64 6. Restart KiCad. 7. Observe that the toolbar icon is now rendered at the expected size. {width=303 height=49} ## Expected behavior Including a 32x32 bitmap in the HiDPI icon bundle should only provide an additional raster source for scaling. It should not change the logical size of the toolbar icon. The bitmap selected from the IPC icon bundle should respect the toolbar's configured logical icon size. In particular, when the toolbar icon size is set to **Small**, the presence of a 32x32 bitmap should not cause the plugin icon to be rendered larger than the surrounding toolbar icons. ## Actual behavior When a 32x32 bitmap is included in the IPC plugin icon bundle, the toolbar icon is rendered larger than the surrounding toolbar icons. Removing only the 32x32 bitmap fixes the problem. The same behavior occurs even when the toolbar icon size is explicitly set to **Small**. ## Working icon set 24x24 48x48 64x64 ## Problematic icon set 24x24 32x32 48x48 64x64 ## Environment OS: Windows 11 Display resolution: 1920x1080 Display scaling: 125% Plugin type: IPC API plugin Application: KiCad PCB Editor I can reproduce this with multiple IPC plugins. Please let me know if a minimal IPC plugin example or the exact PNG files would be useful for reproducing the issue. ## KiCad Version ```text Application: KiCad PCB Editor x64 on x64 Version: 10.0.6, release build Libraries: wxWidgets 3.3.2 FreeType 2.13.3 HarfBuzz 12.3.0 FontConfig 2.17.1 Platform: Windows 11 (сборка 22631), 64-бит редакция, 64 bit, Little endian, wxMSW OpenGL: ATI Technologies Inc., AMD Radeon(TM) Graphics, 4.6.0 Compatibility Profile Context 24.3.1.240216 wxWidgets: 3.3.2 (wchar_t,STL containers) Boost: 1.90.0 OCC: 7.9.2 Curl: 8.18.0 ngspice: 46 Compiler: Visual C++ 1944 without C++ ABI KICAD_IPC_API=ON KICAD_USE_PCH=OFF Locale: Lang: ru_RU Enc: UTF-8 Num: 1 234,5 Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)