Bug report #15900
Magnifier: Zoom factor incompatible with max/min zoom levels
|Affected QGIS version:||2.18.0||Regression?:||No|
|Operating System:||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:||duplicate|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||23818|
When zooming in and out with the mouse wheel or +/- shortcuts, the Magnifier uses a 2x zoom factor. However, the maximum zoom level is set at 1000%, which is not a multiple of 2x. So, when zooming in the % levels are 100, 200, 400, 800, but then 1000. Thus, when zooming out at a 2x factor, the levels are 1000, 500, 250, 125, 62… Therefore, it is impossible to return to 100% zoom when using the shortcuts or mouse wheel. (A similar situation exists when zooming out from 100 to the minimum of 10%, then back in.)
The max/min zoom levels should be set to a multiple of the 2x factor, or the shortcuts should be set to cycle through pre-defined zoom levels.