[Backport release_3_7] Fixing tiles resolutions #4633
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fixes 3liz#4332 Currently, if the map allows you to go beyond the min/zoom resolution of a WMTS or XYZ source, Lizmap won't display anything beyond this min/zoom resolution. OpenLayers is able to do resampling. This can be seen when you zoom in progressively. OpenLayers must be forced to use the max zoom of the grid even when the user goes beyond it. The solution is described on stackoverflow https://stackoverflow.com/questions/43538345/how-to-force-load-tiles-for-lower-resolution and is based on `TileGrid`'s `getZForResolution` method https://github.com/openlayers/openlayers/blob/main/src/ol/tilegrid/TileGrid.js#L634 ```js getZForResolution(resolution, opt_direction) { const z = linearFindNearest( this.resolutions_, resolution, opt_direction || 0, ); return clamp(z, this.minZoom, this.maxZoom); } ``` This method is based on the `this.resolutions_` list of grid resolutions. The index of the resolution closest to that in parameter is then set to the min or max zoom value. So if `this.resolutions_` contains 24 values but maxZoom is 19, then when the map is at levels 20, 21, 22, 23 and 24, the grid will limit queries to zoom 19. Funded by FM Projet
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* Native EPSG:3857 scales * Tiles resolutions
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Backport #4627 and #4634
Authored by: @rldhont