Add fixed width to the preview button

Doing that, the elide will work. Also increase the size of the panel a bit so it will fit better in other languages. Adding also the tooltip in case the text is too long in other languages.

resources/qml/ActionPanel/OutputProcessWidget.qml

@@ -120,6 +120,8 @@ Column
 
             height: UM.Theme.getSize("action_button").height
             text: catalog.i18nc("@button", "Preview")
+            tooltip: text
+            fixedWidthMode: true
 
             onClicked: UM.Controller.setActiveStage("PreviewStage")
             visible: UM.Controller.activeStage != null && UM.Controller.activeStage.stageId != "PreviewStage"

resources/themes/cura-light/theme.json

@@ -361,7 +361,7 @@
         "configuration_selector": [35.0, 4.0],
         "configuration_selector_mode_tabs": [0.0, 3.0],
 
-        "action_panel_widget": [25.0, 0.0],
+        "action_panel_widget": [26.0, 0.0],
         "action_panel_information_widget": [20.0, 0.0],
 
         "machine_selector_widget": [20.0, 4.0],