fix bandwidthScale of the LogForm (#701)

- Revert bandwidthScale when throughput gets smaller
- Don't save coordinates when LogForm is minimized. Otherwise, we get negative values
- activate ConfigForm & ProxyForm & LogForm

shadowsocks-csharp/View/LogForm.cs

@@ -24,7 +24,6 @@ namespace Shadowsocks.View
         #region chart
         List<float> inboundPoints = new List<float>();
         List<float> outboundPoints = new List<float>();
-        long maxSpeed = 0;
         Tuple<float, string, long> bandwidthScale = new Tuple<float, string, long>(0, "B", 1);
         TextAnnotation inboundAnnotation = new TextAnnotation();
         TextAnnotation outboundAnnotation = new TextAnnotation();
@@ -59,6 +58,7 @@ namespace Shadowsocks.View
 
         private void controller_TrafficChanged(object sender, EventArgs e)
         {
+            long maxSpeed = 0;
             inboundPoints.Clear();
             outboundPoints.Clear();
             foreach (var trafficPerSecond in controller.traffic)
@@ -218,7 +218,7 @@ namespace Shadowsocks.View
             config.SetFont(LogMessageTextBox.Font);
             config.SetBackgroundColor(LogMessageTextBox.BackColor);
             config.SetTextColor(LogMessageTextBox.ForeColor);
-            if(!(config.maximized = WindowState == FormWindowState.Maximized)) {
+            if (WindowState != FormWindowState.Minimized && !(config.maximized = WindowState == FormWindowState.Maximized)) {
                 config.top = Top;
                 config.left = Left;
                 config.height = Height;

shadowsocks-csharp/View/MenuViewController.cs

@@ -439,6 +439,7 @@ namespace Shadowsocks.View
             {
                 configForm = new ConfigForm(controller);
                 configForm.Show();
+                configForm.Activate();
                 configForm.FormClosed += configForm_FormClosed;
             }
         }
@@ -453,6 +454,7 @@ namespace Shadowsocks.View
             {
                 proxyForm = new ProxyForm(controller);
                 proxyForm.Show();
+                proxyForm.Activate();
                 proxyForm.FormClosed += proxyForm_FormClosed;
             }
         }
@@ -463,6 +465,7 @@ namespace Shadowsocks.View
             {
                 LogForm f = new LogForm(controller, Logging.LogFilePath);
                 f.Show();
+                f.Activate();
                 f.FormClosed += logForm_FormClosed;
 
                 logForms.Add(f);