Fix regression causing empty label in X/Y cross section plots

Author: PierreRaybaut

CHANGELOG.md

@@ -12,6 +12,11 @@ In this release, test coverage is 79%.
   * This is now fixed by introducing new constants for axis IDs in the
     `plotpy.constants` module, and using them everywhere in the code, thus avoiding
     to import the `plotpy.plot` module just to get the axis IDs
+* Fix empty label in X/Y cross section plots:
+  * This is a regression introduced in V2.1.0
+  * When showing the X/Y cross section plots (using the plot context menu), an empty
+    label was displayed at the center of each of those plots
+  * The label now shows "Enable a marker" as previously
 
 💥 New features / Enhancements:
 

plotpy/panels/csection/csplot.py

@@ -364,6 +364,7 @@ def lut_changed(self, plot: BasePlot) -> None:
 
 
 class HorizontalCrossSectionPlot(BaseCrossSectionPlot):
+    LABEL_TEXT = _("Enable a marker")
     CS_AXIS = X_BOTTOM
     Z_AXIS = Y_LEFT
 
@@ -391,6 +392,7 @@ def axis_dir_changed(self, plot: BasePlot, axis_id: str) -> None:
 
 
 class VerticalCrossSectionPlot(BaseCrossSectionPlot):
+    LABEL_TEXT = _("Enable a marker")
     CS_AXIS = Y_LEFT
     Z_AXIS = X_BOTTOM
     Z_MAX_MAJOR = 3
@@ -419,8 +421,6 @@ def axis_dir_changed(self, plot: BasePlot, axis_id: str) -> None:
 
 
 class XYCrossSectionMixin:
-    LABEL_TEXT = _("Enable a marker")
-
     def connect_plot(self, plot: BasePlot) -> None:
         """Connect plot to cross section plot