GP-1071 - Fixed decompiler hover to prevent the Data Type hover from

appearing when over a scalar

Closes #1071

Ghidra/Features/Decompiler/src/main/java/ghidra/app/decompiler/component/hover/DataTypeDecompilerHover.java

@@ -37,6 +37,8 @@ public class DataTypeDecompilerHover extends AbstractConfigurableHover
 	private static final String NAME = "Data Type Display";
 	private static final String DESCRIPTION =
 		"Show data type contents when hovering over a type name.";
+
+	// note: this is relative to other DecompilerHovers; a higher priority gets called first
 	private static final int PRIORITY = 20;
 
 	protected DataTypeDecompilerHover(PluginTool tool) {

Ghidra/Features/Decompiler/src/main/java/ghidra/app/decompiler/component/hover/FunctionSignatureDecompilerHover.java

@@ -47,6 +47,8 @@ public class FunctionSignatureDecompilerHover extends AbstractConfigurableHover
 	private static final String NAME = "Function Signature Display";
 	private static final String DESCRIPTION =
 		"Show function signatures when hovering over a function name.";
+
+	// note: this is relative to other DecompilerHovers; a higher priority gets called first
 	private static final int PRIORITY = 20;
 
 	protected FunctionSignatureDecompilerHover(PluginTool tool) {

Ghidra/Features/Decompiler/src/main/java/ghidra/app/decompiler/component/hover/ReferenceDecompilerHover.java

@@ -34,7 +34,11 @@ public class ReferenceDecompilerHover extends AbstractReferenceHover
 	private static final String DESCRIPTION =
 		"Shows \"referred to\" code and data from the decompiler.";
 
-	private static final int PRIORITY = 25;
+	// note: this is relative to other DecompilerHovers; a higher priority gets called first
+	// Use high value so this hover gets called first.  The method for determining what the user
+	// is hovering in the Decompiler is less then perfect.  We choose to allow the more precise
+	// hovers get a chance to process the request first.
+	private static final int PRIORITY = 50;
 
 	public ReferenceDecompilerHover(PluginTool tool) {
 		super(tool, PRIORITY);

Ghidra/Features/Decompiler/src/main/java/ghidra/app/decompiler/component/hover/ScalarValueDecompilerHover.java

@@ -36,7 +36,14 @@ import ghidra.program.util.ProgramLocation;
 public class ScalarValueDecompilerHover extends AbstractScalarOperandHover
 		implements DecompilerHoverService {
 
-	private static final int PRIORITY = 20;
+	// note: this is relative to other DecompilerHovers; a higher priority gets called first
+	// Use high value so this hover gets called first.  The method for determining what the user
+	// is hovering in the Decompiler is less then perfect.  We choose to allow the more precise
+	// hovers to get a chance to process the request first.
+	// We want this hover to go before the data type hovers, due to how that hover decides when it
+	// can show a popup, it decides to work when over a scalar.   Having this hover get called
+	// first prevents that.
+	private static final int PRIORITY = 30;
 
 	private static final String NAME = "Scalar Operand Display";
 	private static final String DESCRIPTION =