Add Icon for "Select within distance" + add it to Vector -> Research Tools menu under "Select by location" (#50446)

* add Select within distance icon

* add select within distance to Vector -> research Tools Menu

* rework image according to review

* align image to grid

images/images.qrc

@@ -129,6 +129,7 @@
         <file>themes/default/algorithms/mAlgorithmRegularPoints.svg</file>
         <file>themes/default/algorithms/mAlgorithmRoundRastervalues.svg</file>
         <file>themes/default/algorithms/mAlgorithmSelectLocation.svg</file>
+        <file>themes/default/algorithms/mAlgorithmSelectDistance.svg</file>
         <file>themes/default/algorithms/mAlgorithmSelectRandom.svg</file>
         <file>themes/default/algorithms/mAlgorithmSimplify.svg</file>
         <file>themes/default/algorithms/mAlgorithmSingleToMulti.svg</file>

images/themes/default/algorithms/mAlgorithmSelectDistance.svg

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   height="24"
+   width="24"
+   version="1.1"
+   id="svg10"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs14" />
+  <path
+     d="M 1.5,1.5 H 22.5 V 22.5 H 1.5 Z"
+     fill="#fce94f"
+     stroke="#c4a000"
+     stroke-linecap="round"
+     id="distance-selection"
+     style="stroke:#c4a000;stroke-width:1;stroke-dasharray:none;stroke-opacity:1" />
+  <path
+     d="M 5.5,5.5 H 18.5 V 18.5 H 5.5 Z"
+     fill="#7ea57e"
+     stroke="#c4a000"
+     stroke-linecap="round"
+     id="from-object"
+     style="stroke:#555753;stroke-width:1;stroke-dasharray:none;stroke-opacity:1" />
+</svg>

python/plugins/processing/gui/menus.py

@@ -67,6 +67,7 @@ def initMenusAndToolbars():
                                'native:randompointsonlines': researchToolsMenu,
                                'qgis:regularpoints': researchToolsMenu,
                                'native:selectbylocation': researchToolsMenu,
+                               'native:selectwithindistance': researchToolsMenu,
                                'native:polygonfromlayerextent': researchToolsMenu})
     geoprocessingToolsMenu = vectorMenu + "/" + Processing.tr('&Geoprocessing Tools')
     defaultMenuEntries.update({'native:buffer': geoprocessingToolsMenu,

src/analysis/processing/qgsalgorithmdistancewithin.h

@@ -64,6 +64,8 @@ class QgsSelectWithinDistanceAlgorithm : public QgsDistanceWithinAlgorithm
 
     QgsSelectWithinDistanceAlgorithm() = default;
     void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override;
+    QIcon icon() const override { return QgsApplication::getThemeIcon( QStringLiteral( "/algorithms/mAlgorithmSelectDistance.svg" ) ); }
+    QString svgIconPath() const override { return QgsApplication::iconPath( QStringLiteral( "/algorithms/mAlgorithmSelectDistance.svg" ) ); }
     QString name() const override;
     Flags flags() const override;
     QString displayName() const override;