Fix default window sizes for normal and low-resolution mode.

- Slightly raise the threshold for low-res mode.
- Adjust sizes so that all three category rows will be visible
  during the initial window showing.
- Fix some small padding issues with section labels.

usr/lib/linuxmint/mintinstall/mintinstall.py

@@ -1119,7 +1119,7 @@ def get_low_res_screen(self):
 
         # If it's less than our threshold than consider us 'low res'. The workarea being used is in
         # app pixels, so hidpi will also be affected here regardless of device resolution.
-        if height < 768:
+        if height < 800:
             print("MintInstall: low resolution detected (%dpx height), limiting window height." % (height))
             return True
 
@@ -1391,7 +1391,7 @@ def load_banner(self):
 
             # This overrides the glade 800x600 defaults. 300 is excessively small so the window works
             # out its own minimum height.
-            self.main_window.set_default_geometry(800, 300)
+            self.main_window.set_default_size(800, 500)
             return
 
         for child in box.get_children():

usr/share/linuxmint/mintinstall/mintinstall.glade

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.40.0 -->
+<!-- Generated with glade 3.38.2 -->
 <interface>
   <requires lib="gtk+" version="3.22"/>
   <object class="GtkSizeGroup"/>
@@ -78,7 +78,7 @@
     <property name="can-focus">False</property>
     <property name="window-position">center</property>
     <property name="default-width">800</property>
-    <property name="default-height">650</property>
+    <property name="default-height">685</property>
     <property name="gravity">center</property>
     <child>
       <object class="GtkBox" id="vbox4">
@@ -169,6 +169,7 @@
                                     <property name="visible">True</property>
                                     <property name="can-focus">False</property>
                                     <property name="margin-right">10</property>
+                                    <property name="margin-bottom">8</property>
                                     <property name="orientation">vertical</property>
                                     <child>
                                       <placeholder/>
@@ -189,8 +190,9 @@
                                       <object class="GtkLabel" id="label_featured">
                                         <property name="visible">True</property>
                                         <property name="can-focus">False</property>
+                                        <property name="margin-top">2</property>
+                                        <property name="margin-bottom">6</property>
                                         <property name="xpad">6</property>
-                                        <property name="ypad">12</property>
                                         <property name="label" translatable="yes">Featured</property>
                                         <property name="xalign">0</property>
                                         <property name="yalign">0</property>
@@ -237,8 +239,9 @@
                                       <object class="GtkLabel" id="label_categories_landing">
                                         <property name="visible">True</property>
                                         <property name="can-focus">False</property>
+                                        <property name="margin-top">6</property>
+                                        <property name="margin-bottom">6</property>
                                         <property name="xpad">6</property>
-                                        <property name="ypad">12</property>
                                         <property name="label" translatable="yes">Categories</property>
                                         <property name="xalign">0</property>
                                         <property name="yalign">0</property>
@@ -285,8 +288,9 @@
                                       <object class="GtkLabel" id="label_top_rated">
                                         <property name="visible">True</property>
                                         <property name="can-focus">False</property>
+                                        <property name="margin-top">6</property>
+                                        <property name="margin-bottom">6</property>
                                         <property name="xpad">6</property>
-                                        <property name="ypad">12</property>
                                         <property name="label" translatable="yes">Top Rated</property>
                                         <property name="xalign">0</property>
                                         <property name="yalign">0</property>