Fix bug in download_window.py. Set fixed aspect ratio for forecast images.

fixed_aspect_ratio_widget.py

@@ -0,0 +1,19 @@
+from PyQt5.QtWidgets import QWidget
+
+class FixedAspectRatioWidget(QWidget):
+    space = 10
+    def __init__(self, parent = None):
+        super().__init__(parent)
+        self.labels = []
+
+    def resizeEvent(self, event):
+        h, w = self.height(), self.width()
+        h_lbl = h / 9 - self.space
+        w_lbl = 5 * h_lbl
+
+        if w_lbl > w:
+            w_lbl = w
+            h_lbl = h / 9 - self.space
+
+        for label in self.labels:
+            label.rescale(w_lbl, h_lbl)