Add a dark mode variant of the default qss (#1527)

* Simplify default hydrus qss

* Add dark version of default qss

static/qss/default_hydrus.qss

@@ -17,20 +17,11 @@ QLabel#HydrusValid
 	color: #008000;
 }
 
-QLineEdit#HydrusValid
+QLineEdit#HydrusValid, QTextEdit#HydrusValid, QPlainTextEdit#HydrusValid
 {
 	background-color: #80ff80;
 }
 
-QTextEdit#HydrusValid
-{
-	background-color: #80ff80;
-}
-
-QPlainTextEdit#HydrusValid
-{
-	background-color: #80ff80;
-}
 
 /* Duplicates 'middle' text colour */
 
@@ -39,20 +30,11 @@ QLabel#HydrusIndeterminate
 	color: #000080;
 }
 
-QLineEdit#HydrusIndeterminate
+QLineEdit#HydrusIndeterminate, QTextEdit#HydrusIndeterminate, QPlainTextEdit#HydrusIndeterminate
 {
 	background-color: #000080;
 }
 
-QTextEdit#HydrusIndeterminate
-{
-	background-color: #000080;
-}
-
-QPlainTextEdit#HydrusIndeterminate
-{
-	background-color: #000080;
-}
 
 /* Example: This regex is invalid */
 
@@ -61,29 +43,15 @@ QLabel#HydrusInvalid
 	color: #800000;
 }
 
-QLineEdit#HydrusInvalid
-{
-	background-color: #ff8080;
-}
-
-QTextEdit#HydrusInvalid
+QLineEdit#HydrusInvalid, QTextEdit#HydrusInvalid, QPlainTextEdit#HydrusInvalid
 {
 	background-color: #ff8080;
 }
 
-QPlainTextEdit#HydrusInvalid
-{
-	background-color: #ff8080;
-}
 
 /* Example: Your files are going to be deleted! */
 
-QLabel#HydrusWarning
-{
-	color: #800000;
-}
-
-QCheckBox#HydrusWarning
+QLabel#HydrusWarning, QCheckBox#HydrusWarning
 {
 	color: #800000;
 }

static/qss/default_hydrus_dark.qss

@@ -0,0 +1,141 @@
+/*
+Default QSS for hydrus. This is prepended to any stylesheet loaded in hydrus.
+Copying these entries in your own stylesheets should override these settings.
+This will get more work in future.
+*/
+
+/*
+
+Here are some text and background colours
+
+*/
+
+/* Example: This regex is valid */
+
+QLabel#HydrusValid
+{
+	color: #2ed42e;
+}
+
+QLineEdit#HydrusValid, QTextEdit#HydrusValid, QPlainTextEdit#HydrusValid
+{
+	background-color: #80ff80;
+}
+
+
+/* Duplicates 'middle' text colour */
+
+QLabel#HydrusIndeterminate
+{
+	color: #8080ff;
+}
+
+QLineEdit#HydrusIndeterminate, QTextEdit#HydrusIndeterminate, QPlainTextEdit#HydrusIndeterminate
+{
+	background-color: #8080ff;
+}
+
+
+/* Example: This regex is invalid */
+
+QLabel#HydrusInvalid
+{
+	color: #ff7171;
+}
+
+QLineEdit#HydrusInvalid, QTextEdit#HydrusInvalid, QPlainTextEdit#HydrusInvalid
+{
+	background-color: #ff8080;
+}
+
+
+/* Example: Your files are going to be deleted! */
+
+QLabel#HydrusWarning, QCheckBox#HydrusWarning
+{
+	color: #ff7171;
+}
+
+/*
+
+Buttons on dialogs
+
+*/
+
+QPushButton#HydrusAccept
+{
+	color: #2ed42e;
+}
+
+QPushButton#HydrusCancel
+{
+	color: #ff7171;
+}
+
+/*
+
+This is the green/red button that switches 'include current tags' and similar states on/off
+
+*/
+
+QPushButton#HydrusOnOffButton[hydrus_on=true]
+{
+	color: #2ed42e;
+}
+
+QPushButton#HydrusOnOffButton[hydrus_on=false]
+{
+	color: #ff7171;
+}
+
+/*
+
+This is the Command Palette (default Ctrl+P), and specifically the background colour of the item you currently have selected.
+
+*/
+
+QLocatorResultWidget#selectedLocatorResult
+{
+	background-color: palette(highlight);
+}
+
+QLocatorResultWidget QWidget
+{
+	background: transparent;
+}
+
+
+/*
+
+Custom Controls
+
+These are drawn by hydev on a blank canvas, so they work a little different.
+
+*/
+
+/*
+
+The scanbar beneath video/audio in the media viewer.
+
+*/
+
+QWidget#HydrusAnimationBar
+{
+	qproperty-hab_border: #000000;
+	qproperty-hab_background: #606060;
+	qproperty-hab_nub: #f0f0f0;
+}
+
+
+/*
+
+And this one is odd since we are assigning a colour to <a> html richtext inside a QLabel.
+We hack it with hardcoded 'style' attribute in the html in python code.
+
+*/
+
+
+QLabel#HydrusHyperlink
+{
+	qproperty-link_color: palette(link);
+}